HYDRATION MECHANISM AND KINETIC CHARACTERISTICS OF CaCl<sub>2</sub> EXCITING FLY ASH PASTE FILLING MATERIALS

LUO Pengxiang; DENG Niandong; XIE Geng; XING Congcong; LI Yuxin

doi:10.13205/j.hjgc.202306009

Volume 41 Issue 6

Jun. 2023

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Article Navigation > ENVIRONMENTAL ENGINEERING > 2023 > 41(6): 62-70

LUO Pengxiang, DENG Niandong, XIE Geng, XING Congcong, LI Yuxin. HYDRATION MECHANISM AND KINETIC CHARACTERISTICS OF CaCl2 EXCITING FLY ASH PASTE FILLING MATERIALS[J]. ENVIRONMENTAL ENGINEERING , 2023, 41(6): 62-70. doi: 10.13205/j.hjgc.202306009

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LUO Pengxiang, DENG Niandong, XIE Geng, XING Congcong, LI Yuxin. HYDRATION MECHANISM AND KINETIC CHARACTERISTICS OF CaCl₂ EXCITING FLY ASH PASTE FILLING MATERIALS[J]. ENVIRONMENTAL ENGINEERING , 2023, 41(6): 62-70. doi: 10.13205/j.hjgc.202306009

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HYDRATION MECHANISM AND KINETIC CHARACTERISTICS OF CaCl₂ EXCITING FLY ASH PASTE FILLING MATERIALS

doi: 10.13205/j.hjgc.202306009

1. College of Geology & Environment, Xian University of Science and Technology, Xi'an 710054, China;
2. College of Energy Engineering, Xian University of Science and Technology, Xi'an 710054, China

Received Date: 2022-06-17
Available Online: 2023-09-02

Abstract

Abstract

The early hydration kinetics of cementitious filling materials is an important prerequisite for reasonable designed ratios. In this paper, the early hydration exothermic condition of fly ash paste filling materials (FPFM) with different CaCl₂ concentration excitation was measured by isothermal calorimetry, and the early hydration exothermic heat of different FPFM was fitted based on the Krstulovic-Dabic hydration kinetic model. The hydration kinetic parameters were calculated, the variation characteristics of each stage of the hydration dynamic process were analyzed, and the excitation mechanism of CaCl₂ was explained. The results showed that with the increase of CaCl₂ concentration, the hydration heat of FPFM increased from 1.1 mW/g to 2.9 mW/g, and the total cumulative heat release increased from 16.4 J/g to 29.6 J/g, so that the hydration reaction rate was accelerated and the degree of hydration reaction was deepened. The hydration mechanism of FPFM stimulated by CaCl₂ was NG→I→D, and with the increase of CaCl₂ concentration, the kinetic parameters of FPFM were increased, and the duration of phase I was prolonged, which promoted the pozzarash reaction of fly ash and produced more hydration products. Therefore, through the study of the early hydration kinetic characteristics of CaCl₂ exciting FPFM, the law of its structural evolution is revealed, which provides a certain guide for the application of FPFM.
- paste backfill material,
- calcium chloride excitation,
- thermal evolution,
- hydration kinetics,
- hydration mechanism

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References

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